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Updated MQ-2 Example

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miguel5612 2020-03-26 12:27:02 -05:00
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examples/MQ-2/MQ-2.ino
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@ -9,6 +9,10 @@
modified 23 May 2019 modified 23 May 2019
by Miguel Califa by Miguel Califa
Updated library usage
modified 26 March 2020
by Miguel Califa
This example code is in the public domain. This example code is in the public domain.
*/ */
@ -17,65 +21,50 @@
#include <MQUnifiedsensor.h> #include <MQUnifiedsensor.h>
//Definitions //Definitions
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino #define pin A0 //Analog input 0 of your arduino
#define type 2 //MQ2 #define type "MQ-2" //MQ2
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor //#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor //Declare Sensor
MQUnifiedsensor MQ2(pin, type); MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
//Variables //Variables
float H2, LPG, CO, Alcohol, Propane, Benzene; float CH4, LPG, CO, Alcohol, Hexane, Benzine;
void setup() { void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port Serial.begin(9600); //Init serial port
/***************************** MQInicializar****************************************
Input:
Output:
Remarks: This function configure the pinMode
************************************************************************************/
//init the sensor
MQ2.inicializar();
//pinMode(calibration_button, INPUT);
}
void loop() { //Set math model to calculate the PPM concentration and the value of constants
MQ2.update(); // Update data, the arduino will be read the voltaje in the analog pin MQ2.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
MQ2.setA(574.25); MQ2.setB(-2.222); // Configurate the ecuation values to get LPG concentration
// Calibration setup
MQ2.setR0(9.659574468);
/* /*
//Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo: //If the RL value is different from 10K please assign your RL value with the following method:
MQ2.setRL(10); MQ2.setRL(10);
*/ */
/*
//Rutina de calibracion - Uncomment if you need (setup too and header) /***************************** MQ Init ********************************************/
if(calibration_button) //Remarks: Configure the pin of arduino as input.
{ /************************************************************************************/
float R0 = MQ2.calibrate(); MQ2.init();
MQ2.setR0(R0); /***************************** MQ Init ********************************************/
} //Input: setup flag, if this function are on setup will print the headers (Optional - Default value: False)
*/ //Output: print on serial port the information about sensor and sensor readings
/***************************** MQReadSensor **************************************** //Remarks: Configure the pin of arduino as input.
Input: Gas - Serial print flag /************************************************************************************/
Output: Value in PPM MQ2.serialDebug(true);
Remarks: This function use readPPM to read the value in PPM the gas in the air.
************************************************************************************/
//Read the sensor and print in serial port
//Lecture will be saved in lecture variable
//float lecture = MQ2.readSensor("", true); // Return LPG concentration
// Options, uncomment where you need
H2 = MQ2.readSensor("H2"); // Return H2 concentration
LPG = MQ2.readSensor("LPG"); // Return LPG concentration
CO = MQ2.readSensor("CO"); // Return CO concentration
Alcohol = MQ2.readSensor("Alcohol"); // Return Alcohol concentration
Propane = MQ2.readSensor("Propane"); // Return Propane concentration
Serial.println("***************************");
Serial.println("Lectures for MQ-2");
Serial.print("Volt: ");Serial.print(MQ2.getVoltage(false));Serial.println(" V");
Serial.print("R0: ");Serial.print(MQ2.getR0());Serial.println(" Ohm");
Serial.print("H2: ");Serial.print(H2,2);Serial.println(" ppm");
Serial.print("LPG: ");Serial.print(LPG,2);Serial.println(" ppm");
Serial.print("CO: ");Serial.print(CO,2);Serial.println(" ppm");
Serial.print("Alcohol: ");Serial.print(Alcohol,2);Serial.println(" ppm");
Serial.print("Propane: ");Serial.print(Propane,2);Serial.println(" ppm");
Serial.println("***************************");
} }
void loop() {
MQ2.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ2.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ2.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}